Materials of active-piston actuators

Details Materials of active-piston actuators Materials of active-piston actuators

2007-11-20

2007-11-20

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

11444933

ABSTRACT:
The invention concerns an actuator that includes an active piston, an inner sliding cylinder and an outer cylinder in which the said sliding cylinder is pre-stressed, where one of the cylinders is in a material with a negative thermal expansion coefficient or one that is close to zero, with the other cylinder having a positive thermal expansion coefficient, in which the material of the cylinder with negative expansion coefficient or one close to zero is one of the following materials:γ-ZrMo2O8in cubic structure,Zr2W P2O12,a silicious faujasite,Lu2(WO4)3,ZrW2O8in cubic phase, with nanograins whose size is approximately between 10 nm and 75 nm, orany possible combination of these materials.

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Wang Kai et al: Mode Gruneisen parameters and negative thermal expansion of cubic ZrW208 and ZrMo208; Applied Phsics Letters, AIP, American Institute of Physics, Melvill, NY, US. vol. 76, No. 16, pp. 2203-2204, Apr. 17, 2000.

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